CN114888659A

CN114888659A - Edge grinding machine for processing plant fiber tableware

Info

Publication number: CN114888659A
Application number: CN202210471082.2A
Authority: CN
Inventors: 佘思久; 刘伦传
Original assignee: Anhui Yike Environmental Protection Technology Group Co ltd
Current assignee: Anhui Yike Environmental Protection Technology Group Co ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-08-12
Anticipated expiration: 2042-04-28
Also published as: CN114888659B

Abstract

The invention is suitable for the technical field of battery production, and provides an edge grinding machine for processing plant fiber tableware, which comprises a supporting bottom plate, wherein a grinding assembly is arranged on the supporting bottom plate, the grinding assembly comprises a power unit arranged on the supporting bottom plate, the power unit is connected with the grinding unit, the upper end of the supporting bottom plate is connected with a placing main plate through a rotating unit, and a limiting unit for limiting a bowl body is arranged on the placing main plate. The height adjustment is completed, and the height of the grinding motor is also adjusted.

Description

Edge grinding machine for processing plant fiber tableware

Technical Field

The invention belongs to the technical field of battery production, and particularly relates to an edge grinding machine for processing plant fiber tableware.

Background

Tableware, which means a non-edible tool directly contacting with food during eating, a utensil and an appliance for assisting food to be distributed or taken, and a plurality of disposable tableware are also appeared on the market, the tableware is not good for the environment, and some tableware made of degradable materials are provided, and the tableware comprises a set of utensils, such as metal utensils, ceramic tableware, wine sets, glass utensils, paper utensils, plastic utensils, and various containers with different purposes (such as bowls, dishes, cups, kettles, etc.) and handheld appliances (such as chopsticks, knives, forks, spoons, straws, sticks, etc.), and the like.

The plant fiber tableware is produced by utilizing plant fibers, the harm to the environment can be reduced to the minimum no matter the tableware is produced or recovered, so the plant fiber tableware is widely popularized, the applicant finds a Chinese utility model with the patent publication number of CN211219984U, which is called an edge grinding machine suitable for tableware processing, the round metal dinner plate is placed between a fixed plate and a movable plate, an electric telescopic rod drives the movable plate to descend, the round metal dinner plate is fixed, a rotating shaft is driven to rotate through the rotation of a rotating motor, so that the round metal dinner plate is driven to rotate, the edge grinding operation is carried out on the round metal dinner plate through the rotation of a grinding wheel driven by the grinding motor, the grinding efficiency can be effectively improved, the device has certain defects when in use, because the plant fiber tableware has multiple types, a bowl is one of the plant fiber tableware, the size of bowl has the difference, and present device can not carry out stable fixed and carry out the edging operation to its corner according to the size of bowl to present device is a bowl and carries out the edging operation, need change other bowl after having ground one at every turn, can not be continuous carry out edging operation in proper order to a plurality of bowls, and based on this, the edging machine is used in the processing of the plant fiber tableware that now provides one kind and can solve above-mentioned problem.

Disclosure of Invention

The invention provides an edge grinding machine for processing plant fiber tableware, and aims to solve the problems that the conventional edge grinding machine cannot stably fix bowls according to the sizes of the bowls and can not grind edges of corners of the bowls, the conventional edge grinding machine grinds the edges of one bowl, and another bowl needs to be replaced after grinding one bowl each time, so that the sequential edge grinding operation of a plurality of bowls cannot be continuously performed.

The invention is realized in such a way that the edge grinding machine for processing the vegetable fiber tableware comprises a supporting bottom plate, wherein a grinding assembly is arranged on the supporting bottom plate, the grinding assembly comprises a power unit arranged on the supporting bottom plate, the power unit is connected with the grinding unit, the upper end of the supporting bottom plate is connected with a placing main plate through a rotating unit, and a limiting unit for limiting a bowl body is arranged on the placing main plate.

Preferably, the power unit includes the power cylinder of fixed connection on the supporting baseplate, the first connecting plate of power cylinder's output fixedly connected with, the side and the second connecting plate fixed connection of first connecting plate, the lower extreme fixedly connected with joint plate of second connecting plate, be provided with on the supporting baseplate with the first joint groove of joint plate complex.

Preferably, the polishing unit comprises two third connecting plates which are fixedly connected to the side face of the first connecting plate and symmetrically arranged, the two third connecting plates are connected with a fourth connecting plate through adjusting units, the side face of the fourth connecting plate is fixedly connected with a polishing motor, and the output end of the polishing motor is fixedly connected with a polishing head.

Preferably, the adjusting unit comprises an adjusting body, a first connecting rod is slidably connected in the adjusting body, the end part of the first connecting rod is fixedly connected with a first adjusting plate, the lower end of the first adjusting plate is connected with the adjusting main body through a first spring for providing elastic force, the end part of the first connecting rod is fixedly connected with a second adjusting plate, the lower end of the second adjusting plate is fixedly connected with two third adjusting plates which are symmetrically arranged, the end parts of the two third adjusting plates are connected with a fourth adjusting plate through a first rotating shaft, the fourth adjusting plate is connected with the second adjusting plate through a second spring for providing elasticity, a plurality of groups of limiting plates which are distributed in an array and matched with the fourth adjusting plate are symmetrically arranged in the adjusting main body, the side of three regulating plates is seted up a plurality of array distributions with fourth regulating plate complex through-hole, the side fixedly connected with of adjusting the main part is symmetrical two fifth regulating plates that set up.

Preferably, the rotating unit comprises a rotating main board, the lower end of the rotating main board is rotatably connected with the supporting bottom board through a fifth rotating shaft, the side surface of the fifth rotating shaft is fixedly connected with a ratchet wheel, the side surface of the second connecting board is fixedly connected with a plurality of fifth connecting boards distributed in an array, the end parts of the fifth connecting boards are rotatably connected with pawls through the second rotating shaft, torsion springs are sleeved on the outer sides of the second rotating shafts, a rotating motor is fixedly connected to the rotating main board, the output end of the rotating motor is rotatably connected with a first gear through a third rotating shaft, a plurality of fourth rotating shafts distributed in a circumferential array are further rotatably connected to the rotating main board, the side surfaces of the fourth rotating shafts are fixedly connected with a second gear meshed with the first gear, the upper ends of the fourth rotating shafts are fixedly connected with a first placing board, and the first placing board is provided with a clamping unit, and a plurality of supporting balls distributed in an array are rotatably connected to the second connecting plate.

Preferably, the clamping unit includes the first recess of placing and offering on the board, be connected with the centre gripping bent plate that a plurality of arrays distribute through the air spring in the recess, all be provided with the inclined plane of the centre gripping of being convenient for on a plurality of centre gripping bent plates.

Preferably, the limiting unit comprises a limiting cylinder fixedly connected to the placing main board, the output end of the limiting cylinder is fixedly connected with a second connecting rod, the upper end of the second connecting rod is connected with a sixth connecting plate through a bearing, a plurality of limiting outer rods which are distributed in a plurality of circumferential arrays at the lower end of the sixth connecting plate and correspond to the first placing plates one to one are arranged in the limiting outer rods in a plurality of ways, a connecting groove is formed in each limiting outer rod in a plurality of ways, the limiting outer rods are all sleeved outside the limiting inner rods, a seventh connecting plate is fixedly connected to the end portions of the limiting inner rods, and the side faces of the seventh connecting plate are connected with the connecting groove through a third spring used for providing elasticity.

Compared with the prior art, the embodiment of the application mainly has the following beneficial effects:

1. through the setting of adjusting unit, take through the fifth regulating plate with the hand and hold the regulation main part, press down and move first regulating plate, make the fourth regulating plate rotate around first pivot under the rotation of limiting plate, the fourth regulating plate breaks away from the through-hole this moment, then according to the high removal regulation main part of demand in vertical direction, after removing suitable position, loosen first regulating plate, make the fourth regulating plate insert establish between the limiting plate and insert the through-hole of relevant position, just accomplished the regulation of height, meanwhile, also adjust the height of grinding the motor.

2. Through the setting of rotation unit, when power cylinder's output moved to the left side, under the cooperation of pawl and ratchet, can not drive the fifth pivot and rotate, wait to when power cylinder's output drives the second connecting plate and removes to the right side, under the effect of pawl and ratchet, drive the fifth pivot and rotate ninety degrees, can be convenient carry out the edging operation to next bowl body, it rotates to drive the third pivot and rotates and drive second gear rotation then and drive the fourth pivot and the first board rotation of placing of connecting on it to rotate the motor, it can be faster to drive the bowl body and rotate the edging operation.

Drawings

FIG. 1 is a schematic view of the overall structure of an edge grinding machine for processing plant fiber tableware according to the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 3 is a schematic structural view of the connection of the limiting inner rod and the limiting outer rod in the edge grinding machine for processing plant fiber tableware provided by the invention;

FIG. 4 is a schematic structural diagram of the first gear and the second gear of the edge grinding machine for processing vegetable fiber tableware according to the present invention;

FIG. 5 is a schematic structural diagram of a rotary unit in an edge grinding machine for processing vegetable fiber tableware, according to the present invention;

FIG. 6 is a schematic structural view of the clamping connection between the clamping connection plate and the first clamping connection groove in the edge grinding machine for processing plant fiber tableware provided by the invention;

FIG. 7 is a schematic structural diagram of a clamping unit in an edge grinding machine for processing plant fiber tableware according to the present invention;

fig. 8 is a schematic structural diagram of an adjusting unit in the edge grinding machine for processing plant fiber tableware provided by the invention.

Notations for reference numerals: 1. a support base plate; 2. placing a main board; 3. a bowl body; 401. a power cylinder; 402. a first connecting plate; 403. a second connecting plate; 404. clamping the plate; 405. a first clamping groove; 501. a third connecting plate; 502. a fourth connecting plate; 503. polishing the motor; 504. polishing head; 601. adjusting the main body; 602. a first connecting rod; 603. a first adjusting plate; 604. a first spring; 605. a second adjusting plate; 606. a third adjusting plate; 607. a first rotating shaft; 608. a fourth adjusting plate; 609. a second spring; 610. a limiting plate; 611. a through hole; 612. a fifth adjusting plate; 701. rotating the main board; 702. a fifth rotating shaft; 703. a ratchet wheel; 704. a fifth connecting plate; 705. a second rotating shaft; 706. a pawl; 707. a torsion spring; 708. rotating the motor; 709. a third rotating shaft; 710. a first gear; 711. a fourth rotating shaft; 712. a second gear; 713. a first placing plate; 714. supporting the balls; 801. a groove; 802. a gas spring; 803. clamping the curved plate; 804. an inclined surface; 901. a limiting cylinder; 902. a second connecting rod; 903. a bearing; 904. a sixth connecting plate; 905. a limiting outer rod; 906. connecting grooves; 907. an inner limiting rod; 908. a seventh connecting plate; 909. and a third spring.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Example 1

The embodiment of the invention provides an edge grinding machine for processing vegetable fiber tableware, which comprises a supporting bottom plate 1, wherein a grinding assembly is arranged on the supporting bottom plate 1, the grinding assembly comprises a power unit arranged on the supporting bottom plate 1, the power unit is connected with the grinding unit, the upper end of the supporting bottom plate 1 is connected with a placing main plate 2 through a rotating unit, and a limiting unit for limiting a bowl body 3 is arranged on the placing main plate 2.

When the device is in actual use, the power unit adjusts the position of the polishing unit, the polishing unit can be adjusted according to the size of the bowl body 3, the rotating unit can drive the bowl body 3 to rotate, the edge polishing operation is convenient to carry out, and the limiting unit stably places the bowl body 3.

Example 2

With reference to fig. 6, in this embodiment, on the basis of embodiment 1, the power unit includes a power cylinder 401 fixedly connected to the support base plate 1, an output end of the power cylinder 401 is fixedly connected to a first connection plate 402, a side surface of the first connection plate 402 is fixedly connected to a second connection plate 403, a lower end of the second connection plate 403 is fixedly connected to a clamping plate 404, and a first clamping groove 405 matched with the clamping plate 404 is disposed on the support base plate 1.

When the power unit is actually used, the power cylinder 401 drives the first connecting plate 402 to move close to the bowl body 3, and drives the polishing unit connected to the first connecting plate 402 to move close to the bowl body 3 for edging.

The polishing unit comprises two third connecting plates 501 which are fixedly connected to the side face of the first connecting plate 402 and symmetrically arranged, the two third connecting plates 501 are connected with a fourth connecting plate 502 through adjusting units, the side face of the fourth connecting plate 502 is fixedly connected with a polishing motor 503, and the output end of the polishing motor 503 is fixedly connected with a polishing head 504.

When the polishing unit is actually used, the adjusting unit can adjust the height of the polishing motor 503 according to the size of the bowl body 3, and the rotation of the polishing motor 503 drives the polishing head 504 to rotate so as to perform the polishing operation on the bowl body 3.

Example 3

With reference to fig. 2 and 8, in this embodiment, on the basis of embodiment 2, the adjusting unit includes an adjusting body 601, a first connecting rod 602 is slidably connected to the adjusting body 601, an end of the first connecting rod 602 is fixedly connected to a first adjusting plate 603, a lower end of the first adjusting plate 603 is connected to the adjusting body 601 through a first spring 604 for providing an elastic force, an end of the first connecting rod 602 is fixedly connected to a second adjusting plate 605, a lower end of the second adjusting plate 605 is fixedly connected to two third adjusting plates 606 symmetrically arranged, ends of the two third adjusting plates 606 are both connected to a fourth adjusting plate 608 through a first rotating shaft 607, the fourth adjusting plate 608 is connected to the second adjusting plate 605 through a second spring 609 for providing an elastic force, a plurality of groups of limiting plates 610 which are distributed in an array and matched with the fourth adjusting plate 608 are symmetrically arranged in the adjusting body 601, a plurality of through holes 611 which are distributed in an array and matched with the fourth adjusting plate 608 are formed in a side surface of the third adjusting plate, two fifth adjusting plates 612 which are symmetrically arranged are fixedly connected to the side surfaces of the adjusting body 601.

When the adjusting unit is actually used, the adjusting body 601 is held by hand through the fifth adjusting plate 612, the first adjusting plate 603 is pressed downwards, the fourth adjusting plate 608 rotates around the first rotating shaft 607 under the rotation of the limiting plate 610, at the moment, the fourth adjusting plate 608 is separated from the through hole 611, then the adjusting body 601 is moved according to the required height in the vertical direction, after the adjusting body is moved to the proper position, the first adjusting plate 603 is loosened, the fourth adjusting plate 608 is inserted between the limiting plates 610 and is inserted into the through hole 611 of the corresponding position, the height adjustment is completed, and meanwhile, the height of the grinding motor 503 is also adjusted.

Example 4

With reference to fig. 4, 5 and 7, in this embodiment, on the basis of embodiment 3, the rotating unit includes a rotating main plate 701, a lower end of the rotating main plate 701 is rotatably connected to the supporting base plate 1 through a fifth rotating shaft 702, a side surface of the fifth rotating shaft 702 is fixedly connected to a ratchet 703, a side surface of the second connecting plate 403 is fixedly connected to a plurality of fifth connecting plates 704 distributed in an array, end portions of the plurality of fifth connecting plates 704 are rotatably connected to a pawl 706 through a second rotating shaft 705, and outer sides of the plurality of second rotating shafts 705 are respectively sleeved with a torsion spring 707, a rotating motor 708 is fixedly connected to the rotating main plate 701, an output end of the rotating motor 708 is rotatably connected to a first gear 710 through a third rotating shaft 709, the rotating main plate 701 is further rotatably connected to a plurality of fourth rotating shafts distributed in a circumferential array, a side surface of the plurality of fourth rotating shafts is respectively fixedly connected to a second gear 712 engaged with the first gear 710, an upper end of the plurality of fourth rotating shafts 711 is fixedly connected to a first placing plate 711, the plurality of first placing plates 713 are each provided with a clamping unit, and the second connecting plate 403 is rotatably connected with a plurality of supporting balls 714 distributed in an array.

The clamping unit comprises a groove 801 formed in a first placing plate 713, a plurality of clamping curved plates 803 distributed in an array mode are connected in the groove 801 through a gas spring 802, and inclined surfaces 804 convenient to clamp are arranged on the plurality of clamping curved plates 803.

When the rotating unit is used actually, when the output end of the power cylinder 401 moves to the left side, under the cooperation of the pawl 706 and the ratchet wheel 703, the fifth rotating shaft 702 cannot be driven to rotate, when the output end of the power cylinder 401 drives the second connecting plate 403 to move to the right side, under the action of the pawl 706 and the ratchet wheel 703, the fifth rotating shaft 702 is driven to rotate ninety degrees, the next bowl body 3 can be conveniently edged, the rotating motor 708 rotates to drive the third rotating shaft 709 to rotate so as to drive the first gear 710 to rotate and then drive the second gear 712 to rotate to drive the fourth rotating shaft 711 and the first placing plate 713 connected thereto to rotate, and the bowl body 3 is driven to rotate to carry out edging operation faster.

Example 5

With reference to fig. 3, on the basis of embodiment 4, the limiting unit includes a limiting cylinder 901 fixedly connected to the placement main board 2, an output end of the limiting cylinder 901 is fixedly connected to a second connecting rod 902, an upper end of the second connecting rod 902 is connected to a sixth connecting plate 904 through a bearing 903, a lower end of the sixth connecting plate 904 is fixedly connected to a plurality of limiting outer rods 905 distributed in a circumferential array manner and corresponding to the first placement board 713 in a one-to-one manner, a connecting groove 906 is disposed in each of the plurality of limiting outer rods 905, each of the plurality of limiting outer rods 905 is sleeved on an outer side of the limiting inner rod 907, an end of the limiting inner rod 907 is fixedly connected to a seventh connecting plate 908, and a side surface of the seventh connecting plate 908 is connected to the connecting groove 906 through a third spring 909 for providing elastic force.

When the limiting unit is actually used, the limiting cylinder 901 drives the second connecting rod 902 to move downwards, the limiting inner rod 907 and the limiting outer rod 905 connected to the sixth connecting plate 904 are driven to move downwards, and under the action of the third spring 909, the end of the limiting inner rod 907 is in contact with the bowl body 3 to limit the limiting inner rod 907.

In summary, the working principle of the invention is as follows: the adjusting body 601 is held by a hand through the fifth adjusting plate 612, the first adjusting plate 603 is pressed downwards, the fourth adjusting plate 608 rotates around the first rotating shaft 607 under the rotation of the limiting plate 610, at the moment, the fourth adjusting plate 608 is separated from the through hole 611, then the adjusting body 601 is moved in the vertical direction according to the required height, after the adjusting body is moved to the proper position, the first adjusting plate 603 is loosened, the fourth adjusting plate 608 is inserted between the limiting plates 610 and is inserted into the through hole 611 of the corresponding position, the height adjustment is completed, and meanwhile, the height of the grinding motor 503 is also adjusted; when the output of power cylinder 401 moved to the left, under the cooperation of pawl 706 and ratchet 703, can not drive fifth pivot 702 and rotate, wait to when power cylinder 401's output drove second connecting plate 403 and moved to the right side, under the effect of pawl 706 and ratchet 703, drive fifth pivot 702 and rotate ninety degrees, can be convenient carry out the edging operation to next bowl body 3, it rotates to rotate motor 708 and drives third pivot 709 to rotate and then drive second gear 712 and rotate and drive fourth pivot 711 and the first board 713 of placing of connecting on it and rotate, it can be faster to drive bowl body 3 to rotate and carry out the edging operation.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a vegetable fibre is edging machine for tableware processing, includes supporting baseplate (1), its characterized in that, be provided with the subassembly of polishing on supporting baseplate (1), wherein, the subassembly of polishing includes the power pack that sets up on supporting baseplate (1), power pack and the unit connection of polishing, the upper end of supporting baseplate (1) is connected with placing mainboard (2) through rotating the unit, it is provided with on mainboard (2) and carries out spacing unit to the bowl body (3).

2. The edge grinding machine for vegetable fiber tableware processing according to claim 1, wherein said power unit comprises a power cylinder (401) fixedly connected to the supporting bottom plate (1), the output end of said power cylinder (401) is fixedly connected with a first connecting plate (402), the side surface of said first connecting plate (402) is fixedly connected with a second connecting plate (403), the lower end of said second connecting plate (403) is fixedly connected with a clamping plate (404), and said supporting bottom plate (1) is provided with a first clamping groove (405) matched with said clamping plate (404).

3. The edge grinding machine for vegetable fiber tableware processing according to claim 2, wherein said grinding unit comprises two symmetrically arranged third connecting plates (501) fixedly connected to the side of the first connecting plate (402), two of said third connecting plates (501) are connected with a fourth connecting plate (502) through an adjusting unit, the side of said fourth connecting plate (502) is fixedly connected with a grinding motor (503), and the output end of said grinding motor (503) is fixedly connected with a grinding head (504).

4. The edge grinding machine for vegetable fiber tableware processing according to claim 3, wherein said adjusting unit comprises an adjusting body (601), said adjusting body (601) is internally connected with a first connecting rod (602), the end of said first connecting rod (602) is fixedly connected with a first adjusting plate (603), the lower end of said first adjusting plate (603) is connected with said adjusting body (601) through a first spring (604) for providing elasticity, the end of said first connecting rod (602) is fixedly connected with a second adjusting plate (605), the lower end of said second adjusting plate (605) is fixedly connected with two third adjusting plates (606) which are symmetrically arranged, the ends of said two third adjusting plates (606) are connected with a fourth adjusting plate (608) through a first rotating shaft (607), said fourth adjusting plate (608) is connected with said second adjusting plate (605) through a second spring (609) for providing elasticity, the adjusting device is characterized in that a plurality of groups of limiting plates (610) which are distributed in an array mode and matched with a fourth adjusting plate (608) are symmetrically arranged in the adjusting main body (601), through holes (611) which are distributed in a plurality of arrays and matched with the fourth adjusting plate (608) are formed in the side faces of the three adjusting plates, and two fifth adjusting plates (612) which are symmetrically arranged are fixedly connected to the side faces of the adjusting main body (601).

5. The edge grinding machine for vegetable fiber tableware processing according to claim 2, wherein said rotating unit comprises a rotating main plate (701), the lower end of said rotating main plate (701) is rotatably connected with the supporting base plate (1) through a fifth rotating shaft (702), the side of said fifth rotating shaft (702) is fixedly connected with a ratchet wheel (703), the side of said second connecting plate (403) is fixedly connected with a plurality of fifth connecting plates (704) distributed in an array, the end of said plurality of fifth connecting plates (704) is rotatably connected with a pawl (706) through a second rotating shaft (705), and the outer side of said plurality of second rotating shafts (705) is sleeved with a torsion spring (707), said rotating main plate (701) is fixedly connected with a rotating motor (708), the output end of said rotating motor (708) is rotatably connected with a first gear (710) through a third rotating shaft (709), the rotating main plate (701) is further rotatably connected with a plurality of fourth rotating shafts (711) distributed in a circumferential array mode, the side faces of the fourth rotating shafts (711) are fixedly connected with second gears (712) meshed with the first gears (710), the upper ends of the fourth rotating shafts (711) are fixedly connected with first placing plates (713), clamping units are arranged on the first placing plates (713), and supporting balls (714) distributed in a plurality of arrays are rotatably connected to the second connecting plate (403).

6. The edge grinding machine for vegetable fiber tableware processing according to claim 5, wherein said clamping unit comprises a groove (801) formed on the first placing plate (713), a plurality of clamping curved plates (803) distributed in an array are connected in the groove (801) through a gas spring (802), and inclined surfaces (804) convenient for clamping are arranged on the plurality of clamping curved plates (803).

7. The edge grinding machine for vegetable fiber tableware processing according to claim 6, the limiting unit comprises a limiting cylinder (901) fixedly connected to the placing main plate (2), the output end of the limiting cylinder (901) is fixedly connected with a second connecting rod (902), the upper end of the second connecting rod (902) is connected with a sixth connecting plate (904) through a bearing (903), the lower end of the sixth connecting plate (904) is fixedly connected with a plurality of limiting outer rods (905) which are distributed in a circumferential array and correspond to the first placing plates (713) one by one, connecting grooves (906) are arranged in the plurality of limiting outer rods (905), the plurality of limiting outer rods (905) are sleeved on the outer side of the limiting inner rod (907), the end part of the inner limiting rod (907) is fixedly connected with a seventh connecting plate (908), the side of the seventh connecting plate (908) is connected with the connecting groove (906) through a third spring (909) for providing elastic force.